METHOD OF PHOTOMETRIC DETERMINATION OF RARE-EARTH ELEMENTS

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FIELD : chemistry.SUBSTANCE : invention relates to analytical chemistry, namely to photometric methods of determining rare earth elements in natural objects and technical materials. method includes decomposition of sample by its melting with mixture of anhydrous soda and borax, processing decomposed sample with hydrochloric acid, precipitation of metal hydroxides, washing residue of metal hydroxides with ammonium hydroxide, elimination interfering impact of titanium compounds by addition of hydrogen peroxide before precipitation of hydroxides, elimination of interfering impact of iron and aluminium by masking iron by addition of ascorbic acid and masking aluminium by addition of sulfosalicylic acid, conversion of non-soluble compounds of rare earth elements into soluble compounds, transfer of rare earth elements into dyed compounds with arsenazo III and further photometry.EFFECT : invention makes it possible to reduce time for analysis performance, as well as reduce labour consumption of analysis and increase its accuracy.5 cl, 1 tbl